Iran's president, Mahmoud Ahmadinejad, hinted today that he may be ready to resume nuclear talks – but only after the west had been punished for imposing new sanctions.

Punitive measures targeting Iran's Revolutionary Guard, companies and banks that were approved by the UN security council last week are to be followed by EU sanctions to be agreed tomorrow.

"You showed bad temper, reneged on your promise and again resorted to devilish manners," Ahmadinejad said of the countries – 12 of the 15 members of the security council – that voted for the fourth set of sanctions in as many years.

"We set conditions [for talks] so that, God willing, you'll be punished a bit and sit at the negotiating table like a polite child," he told a crowd during a visit to the central Iranian town of Shahr-e-Kord. "We are ready to resume talks but we have conditions that will be announced soon. We will not withdraw from our nuclear path even one iota because of sanctions."

Ahmadinejad claimed that the main purpose behind the latest UN sanctions was "to rescue the Zionist regime from the heavy pressure of global public opinion" – an apparent reference to Israel's bloody interception of an aid flotilla trying to break the blockade of the Gaza Strip.

Iran's foreign ministry summoned the British ambassador to Tehran to accuse the UK and other unnamed western countries of supporting an exiled "terrorist" group — a familiar charge at times of tension between the two countries.

The Iranian president also attacked Barack Obama for "meddling in Iranian affairs" by praising the courage of protesters on the anniversary of last year's disputed Iranian election, which the opposition says was rigged by the regime.

During the speech, broadcast live on the Irinn state TV network, the sound faded away when Ahmadinejad paused to allow for the chanting of slogans, and came back when he resumed speaking. This practice was also used after complaints about unemployment were heard during an address he gave in Khorramshahr last month.

The US and most of the west believe Iran is pursuing nuclear technology in order to produce weapons. Tehran insists its programme is for peaceful purposes, attacking western double standards over nuclear disarmament and Israel and saying there should have been wider international support for a nuclear fuel swap deal it agreed with Brazil and Turkey last month.

Ali Larijani, speaker of the Iranian parliament, warned meanwhile that Iran would respond in a "tough" way if the US and other "adventurous" countries attempted to inspect Iranian ships and planes under the new UN sanctions regime. "This retaliation is part of defending our national interests," Larijani said amid chants of "Death to America" and "Death to Israel". MPs called on the government to continue enriching uranium to 20% – a level that is seen by experts as going a significant way towards producing weapons-grade fissile material.

Iran's chief nuclear official announced plans to build a new nuclear reactor for radioisotope production that is more powerful than its Tehran research facility.

Ali Akbar Salehi also said Iran would be also ready with its first batch of fuel plates for its existing research centre by September 2011. He added that Tehran wanted to commission "several such reactors across the country so that we can produce radioisotopes for sale and export to the regional and Islamic countries that need them".